CN210710943U - One-step denitrification device based on iron salt circulation - Google Patents
One-step denitrification device based on iron salt circulation Download PDFInfo
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- CN210710943U CN210710943U CN201921620819.2U CN201921620819U CN210710943U CN 210710943 U CN210710943 U CN 210710943U CN 201921620819 U CN201921620819 U CN 201921620819U CN 210710943 U CN210710943 U CN 210710943U
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- 150000002505 iron Chemical class 0.000 title claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 202
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 22
- 239000012528 membrane Substances 0.000 claims abstract description 18
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract description 13
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 11
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 241000894006 Bacteria Species 0.000 claims abstract description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 26
- 238000010992 reflux Methods 0.000 claims description 25
- 244000005700 microbiome Species 0.000 claims description 15
- 229910021529 ammonia Inorganic materials 0.000 claims description 13
- 239000000969 carrier Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 241001453382 Nitrosomonadales Species 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052742 iron Inorganic materials 0.000 abstract description 10
- -1 iron ions Chemical class 0.000 abstract description 10
- 239000002351 wastewater Substances 0.000 abstract description 10
- 230000001651 autotrophic effect Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 9
- 238000004064 recycling Methods 0.000 abstract description 7
- 150000003839 salts Chemical class 0.000 abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 6
- 229910002651 NO3 Inorganic materials 0.000 abstract description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 abstract description 4
- 241000108664 Nitrobacteria Species 0.000 abstract description 2
- 230000004060 metabolic process Effects 0.000 abstract description 2
- 239000001272 nitrous oxide Substances 0.000 abstract description 2
- 238000006396 nitration reaction Methods 0.000 abstract 2
- 239000012295 chemical reaction liquid Substances 0.000 abstract 1
- 239000003814 drug Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 7
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 229910001448 ferrous ion Inorganic materials 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 229910001447 ferric ion Inorganic materials 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- NPFOYSMITVOQOS-UHFFFAOYSA-K iron(III) citrate Chemical group [Fe+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NPFOYSMITVOQOS-UHFFFAOYSA-K 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 238000012163 sequencing technique Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 150000002823 nitrates Chemical class 0.000 description 2
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229960002413 ferric citrate Drugs 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model discloses a one-step denitrification device based on iron salt circulation, wherein a first reaction chamber is arranged above a second reaction chamber and is connected with the second reaction chamber through a water inlet pipe, and the first reaction chamber is used for nitration reaction to generate nitrous oxide and ferric iron; the nitration reaction liquid enters a second reaction chamber from a first reaction chamber; the second reaction chamber is used for autotrophic denitrification reaction, and nitrate and ferrous iron from the first reaction chamber react to generate nitrogen and ferric iron so as to realize denitrification; the water outlet end of the second reaction chamber is provided with a reverse osmosis membrane for intercepting iron ions, the second reaction chamber is provided with a return pipe interface, and the concentrated ferric iron solution is returned to the first reaction chamber for recycling. The utility model provides different living environments for growth and metabolism by separating nitrobacteria and denitrifying bacteria in two reaction chambers; the ferric iron concentrated solution generated by the second reaction chamber flows back to the first reaction chamber, and the wastewater is denitrified by recycling the ferric salt in one step, so that the method has innovation consciousness and practical value.
Description
Technical Field
The utility model relates to a sewage treatment field, concretely relates to one step of denitrification facility based on molysite circulation.
Background
The nitrogen pollution of water in China is serious, and treatment is urgently needed. The traditional denitrification technology takes organic matters as electron donors, and has high denitrification efficiency and large investment cost. Particularly, after the 'source control and emission reduction' is implemented nationwide, the organic pollution of the water body is effectively controlled, the C/N ratio in the water body is greatly reduced, and the search for a novel autotrophic nitrogen removal technology is urgent.
The shortcut nitrification-anaerobic ammonia oxidation technology is a novel autotrophic nitrogen removal technology and is applied to the treatment of actual wastewater, however, due to the difficulty in controlling the shortcut nitrification and the delicate nature of anaerobic ammonia oxidation bacteria, the popularization and application of the shortcut nitrification-anaerobic ammonia oxidation technology are hindered.
In 1996, Straub et al proposed an autotrophic denitrification technique, where microorganisms utilized ferrous salts as electron donors for denitrification. Once the technology is put forward, the technology is concerned by broad scholars. The iron-type autotrophic denitrification technology has the advantages of high safety, no toxicity, low price and the like.
Then, another iron-based ammonia oxidation technology is available, namely, ammonia oxidizing bacteria oxidize ammonium ions into nitrates by using ferric iron as an electron acceptor.
However, the autotrophic denitrification with iron has the problem that iron salt cannot be effectively utilized, and iron salt needs to be continuously added in the autotrophic denitrification stage, so that the utilization rate of iron salt is low, and the requirement of resource utilization is not met.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a one-step denitrification facility based on molysite circulation to there is the problem that the molysite utilization ratio is low among the solution prior art in the autotrophic denitrification process.
In order to achieve the above object, the present invention adopts the following specific technical solutions:
a one-step denitrification device based on iron salt circulation comprises a first reaction chamber and a second reaction chamber, wherein the first reaction chamber is arranged above the second reaction chamber, and the first reaction chamber is connected with the second reaction chamber through a water inlet pipe of the second reaction chamber; a filter screen is arranged at the upper port of the water inlet pipe of the second reaction chamber, a first dosing pipe and a first exhaust port are arranged at the top of the first reaction chamber, and a second dosing pipe and a second exhaust port are arranged at the top of the second reaction chamber; microorganism carriers are uniformly distributed in the first reaction chamber and the second reaction chamber, wherein ammonia oxidizing bacteria capable of oxidizing ammonia by ferric iron are attached to the microorganism carriers in the first reaction chamber, and denitrifying bacteria capable of denitrifying by ferrous iron are attached to the microorganism carriers in the second reaction chamber; a mud bucket is arranged at the bottom of the second reaction chamber, and a mud pipe is connected to the bottom of the mud bucket; stirring devices are arranged in the first reaction chamber and the second reaction chamber, and the first reaction chamber is also provided with a first reaction chamber water inlet pipe; the second reaction chamber is provided with a water outlet pipe, the inlet end of the water outlet pipe is provided with a reverse osmosis membrane, and the second reaction chamber is connected with the first reaction chamber through a reflux branch; a pH meter is arranged in the second reaction chamber.
The first reaction chamber water inlet pipe is connected with the lower part of the first reaction chamber.
The inlet of the water outlet pipe of the second reaction chamber and the inlet of the return pipe are both connected with the lower part of the second reaction chamber.
The second reaction chamber is connected with a high-pressure pump, participates in the reverse osmosis process, and is used for providing negative pressure conditions when the reverse osmosis membrane performs reverse osmosis.
The reflux branch comprises a reflux pump, the inlet of the reflux pump is connected with the lower part of the second reaction chamber through a pipeline, and the outlet of the reflux pump is connected with the inlet of the first reaction chamber through a pipeline.
The first medicine feeding pipe and the second medicine feeding pipe are identical in structure and are of a hollow tubular structure, and through holes are uniformly formed in the surfaces of the lower parts of the first medicine feeding pipe and the second medicine feeding pipe.
The utility model discloses there is following beneficial effect:
the one-step denitrification device based on the iron salt circulation of the utility model utilizes the upper and lower two different reaction chambers (namely the first reaction chamber and the second reaction chamber) of the reaction body device to reduce the competition among different strains, provides more favorable living environment for the strains with different ecological niches and is favorable for the stable operation of the one-step denitrification device; and the circulation of ferric salt is realized, the concentrated solution of ferric ions trapped in the second reaction chamber is supplied to the first reaction chamber through a reflux branch for recycling, resources are recovered, and the requirement of ferric salt for denitrification of wastewater is greatly reduced. Because the iron ions are completely retained in the second reaction chamber by the reverse osmosis membrane, no iron ions are lost, so that the utilization rate of the iron salt is increased; the utility model provides different living environments for growth and metabolism by separating nitrobacteria and denitrifying bacteria in two reaction chambers; the ferric iron concentrated solution generated by the second reaction chamber flows back to the first reaction chamber, and the wastewater is denitrified by recycling the ferric salt in one step, so that the method has innovation consciousness and practical value.
Drawings
Fig. 1 is a schematic structural diagram of a one-step denitrification device based on iron salt circulation.
FIG. 2 is a process flow chart of denitrification by using the one-step denitrification device based on iron salt circulation.
FIG. 3 is a detailed view of the quincunx cloth holes of the dosing pipe in the one-step denitrification device based on the iron salt circulation.
In the figure: i-a first reaction chamber and II-a second reaction chamber; 1-a first reaction chamber water inlet pipe, 2-a first valve, 3-a microorganism carrier, 4-a first medicine adding pipe, 5-a second medicine adding pipe, 6-a stirring device, 7-a filter screen, 8-a first exhaust port, 9-a second exhaust port, 10-a pH meter, 11-a reverse osmosis membrane, 12-a water outlet pipe, 13-a second valve, 14-a third valve, 15-a reflux pump, 16-a fourth valve, 17-a reflux pipe, 18-a mud bucket, 19-a mud discharging pipe, 20-a fifth valve, 21-a high-pressure pump, 22-a second reaction chamber water inlet pipe, 23-a sixth valve and 24-a through hole.
Detailed Description
The invention is further described with reference to the following specific drawings and embodiments. The preferred embodiments may be combined in any combination, unless otherwise specified or conflicting.
Referring to fig. 1, the one-step denitrification device based on iron salt circulation of the present invention comprises a first reaction chamber i and a second reaction chamber ii, wherein the first reaction chamber i is disposed above the second reaction chamber ii, and the first reaction chamber i and the second reaction chamber ii are connected through a second reaction chamber water inlet pipe 22; a filter screen 7 is arranged at the upper port of the water inlet pipe 22 of the second reaction chamber, a first dosing pipe 4 and a first exhaust port are arranged at the top of the first reaction chamber I, and a second dosing pipe 5 and a second exhaust port are arranged at the top of the second reaction chamber II; microorganism carriers 3 are uniformly distributed in the first reaction chamber I and the second reaction chamber II, wherein ammonia oxidizing bacteria capable of utilizing ferric iron to carry out ammonia oxidation are attached to the microorganism carriers 3 in the first reaction chamber I, and denitrifying bacteria capable of utilizing ferrous iron to carry out denitrification are attached to the microorganism carriers 3 in the second reaction chamber II; a mud bucket 18 is arranged at the bottom of the second reaction chamber II, and a mud pipe 19 is connected to the bottom of the mud bucket 18; stirring devices 6 are arranged in the first reaction chamber I and the second reaction chamber II, and the first reaction chamber I is also provided with a first reaction chamber water inlet pipe 1; the second reaction chamber II is provided with a water outlet pipe 12, the inlet end of the water outlet pipe 12 is provided with a reverse osmosis membrane 11, and the second reaction chamber II is connected with the first reaction chamber I through a reflux branch; and a pH meter 10 is arranged in the second reaction chamber II.
As the preferred embodiment of the present invention, the first reaction chamber inlet pipe 1 is connected to the lower portion of the first reaction chamber I.
As the preferred embodiment of the present invention, the inlet of the water outlet pipe 12 and the inlet of the return pipe 17 of the second reaction chamber are connected with the lower part of the second reaction chamber II.
As the preferred embodiment of the present invention, the second reaction chamber II is connected with a high pressure pump 21, which participates in the reverse osmosis process, when the reverse osmosis membrane performs reverse osmosis, for providing a negative pressure condition.
As the utility model discloses preferred embodiment, the backward flow branch road includes backwash pump 15, and the entry of backwash pump 15 passes through pipeline and II sub-unit connections in second reacting chamber, and the entry linkage of pipeline and first reacting chamber I is passed through in the export of backwash pump 15.
As a preferred embodiment of the present invention, referring to fig. 1 to 3, the first chemical feeding pipe 4 and the second chemical feeding pipe 5 of the present invention have the same structure, and are of a hollow tubular structure, and the lower surfaces of the first chemical feeding pipe 4 and the second chemical feeding pipe 5 are uniformly provided with through holes.
Referring to fig. 2 and fig. 1, the one-step denitrification method based on iron salt circulation of the present invention comprises the following steps:
ammonia-containing wastewater enters a first reaction chamber I through a first reaction chamber water inlet pipe 1, and ferric salt in a ferric citrate form is added into the first reaction chamber I through a first medicine adding pipe 4; the stirring device 6 in the first reaction chamber I is continuously stirred, the ammonia-containing wastewater reacts with the microbial carrier 3 in the first reaction chamber I, gas generated by the reaction is discharged through the first exhaust port, and mixed liquid containing ferrous ions and nitrates generated by the reaction flows to the second reaction chamber II through the second reaction chamber water inlet pipe 22 and the filter screen 7;
in the second reaction chamber II, the stirring device 6 is continuously stirred, the nitrate and ferrous ions are subjected to denitrification under the action of the microbial carrier 3 in the second reaction chamber II, and the generated gas is discharged along with a second exhaust port; a preset amount of acid is added from the second medicine adding pipe 5, so that the second reaction chamber II is always non-alkaline;
when the second reaction chamber II is drained through the water outlet pipe 12, the iron ions are intercepted by the reverse osmosis membrane 11 in the second reaction chamber II, along with the drainage of the second reaction chamber II, the concentration of the iron ions in the second reaction chamber II is increased, when the internal and external pressure difference of the reverse osmosis membrane 11 is larger than a preset value, the water outlet pipe 12 and the water inlet pipe 22 of the second reaction chamber are cut off, and liquid in the second reaction chamber II flows back to the first reaction chamber I through the backflow branch for recycling.
The utility model discloses a one step of denitrification facility based on molysite circulation does not have the loss of ferric ion when carrying out waste water denitrogenation, so increases the utilization ratio of molysite for the molysite demand of waste water denitrogenation greatly reduces, can realize one step of denitrogenation of ferrite to waste water through cyclic utilization, and it is short to have the flow, make full use of resource and the effectual characteristics of denitrogenation.
Examples
As shown in fig. 1, the one-step denitrification apparatus based on iron salt circulation in this embodiment mainly includes a first reaction chamber i and a second reaction chamber ii, and specifically further includes: the device comprises a first reaction chamber water inlet pipe 1, a second valve, a microorganism carrier 3, a first dosing pipe 4, a second dosing pipe 5, a stirring device 6, a filter screen 7, a first exhaust port, a second exhaust port, a pH meter 10, a reverse osmosis membrane 11, a water outlet pipe 12, a second valve 13, a third valve 14, a reflux pump 15, a fourth valve 16, a reflux pipe 17, a mud bucket 18, a mud pipe 19, a fifth valve 20, a high-pressure pump 21, a second reaction chamber water inlet pipe 22 and a sixth valve 23.
In this embodiment, the one-step denitrification device based on iron salt circulation is a sequencing batch reactor, the first reaction chamber i and the second reaction chamber ii are connected by a second reaction chamber water inlet pipe 22, and the second reaction chamber water inlet pipe 22 is connected with a fourth valve 16. As shown in FIG. 1, a filter 7 is disposed at the inlet of the second reaction chamber inlet pipe 22 (i.e. the second reaction chamber inlet pipe 22 is located at one end of the first reaction chamber I), and the filter 7 is used for trapping biological fillers. The top of the first reaction chamber I is provided with a first dosing pipe 4 and a first exhaust port 8, and the top of the second reaction chamber II is provided with a second dosing pipe 5 and a second exhaust port 9; microorganism carriers 3 are uniformly distributed in the first reaction chamber I and the second reaction chamber II, wherein ammonia oxidizing bacteria capable of oxidizing ammonia by ferric iron are attached to the microorganism carriers 3 of the first reaction chamber I, and denitrifying bacteria capable of denitrifying by ferrous iron are attached to the microorganism carriers 3 of the second reaction chamber II; and a mud bucket 18 and a mud pipe 19 are arranged at the bottom of the second reaction chamber II, the mud pipe 19 is connected with the bottom of the mud bucket 18, and a fifth valve 20 is arranged on the mud pipe 19. The first reaction chamber water inlet pipe 1 is positioned at the lower right side of the first reaction chamber I, the first valve 2 is arranged on the first reaction chamber water inlet pipe 1, and the stirring device 6 is arranged in the first reaction chamber I; the water outlet pipe 12 and the return pipe 17 of the second reaction chamber are both positioned at the lower left side of the second reaction chamber II, the water outlet pipe 12 is provided with a reverse osmosis membrane 11, the high-pressure pump 21 is connected with the lower part of the second reaction chamber II, and the sixth valve 23 is arranged on a pipeline connecting the high-pressure pump 21 and the second reaction chamber II; the water outlet pipe 12 is also provided with a second valve 13; a filter screen 7 is arranged at the position of the return pipe 17; the reflux pipe 17 is provided with a reflux pump 15, the reflux pipe 17 connected with the inlet of the reflux pump 15 is provided with a third valve 14, and the reflux pipe 17 connected with the outlet of the flow pump 15 is connected to the first reaction chamber water inlet pipe 1. The second reaction chamber II is also provided with a stirring device 6 inside.
A reverse osmosis membrane 11 is arranged in front of a water outlet pipe 12 of the second reaction chamber II, after the denitrification reaction of the second reaction chamber II is finished, the second valve 13 and the sixth valve 23 are opened, the third valve 14 is closed, and the solution in the second reaction chamber II continuously enters the water outlet pipe 12 through the reverse osmosis membrane 11; when the internal and external pressure difference of the reverse osmosis membrane reaches 15psi (namely 1.5 kg, the blockage critical value of the reverse osmosis membrane), the second valve 13, the fourth valve 16 and the sixth valve 23 are closed, so that water does not enter the second reaction chamber II any more, the reflux pump 15 is opened, the third valve 14 is opened, so that the water in the second reaction chamber II passes through the filter screen 7, the concentrated iron ion mixed solution is pressurized by the reflux pump 15, and flows back to the water inlet pipe 1 of the first reaction chamber through the reflux pipe 17 and then enters the first reaction chamber I for recycling.
The above-mentioned devices can be set in size and proportion according to circumstances, and the one-step denitrification device based on the circulation of the ferric salt is a sequencing batch reactor, wherein the first reaction chamber I and the second reaction chamber II are mainly cylindrical bodies, and the hopper 18 is a cone. The total height of the one-step denitrification device is 750mm, and the diameter of a cylinder at the upper part of the first reaction chamber I is 240 mm; the diameter of the cylinder at the upper part of the second reaction chamber II is 190 mm. The sequencing batch reactor (i.e., the one-step denitrification device in this example) has a total effective volume of 25L and a working volume of 24L. Adding ferric citrate into the first medicine adding pipe 4: the mass ratio of ammonia to nitrogen is (8.16-10.88): 1 (or the molar ratio is (0.6-0.8): 1); the volume ratio of the first reaction chamber I to the second reaction chamber II is 1.0: 1.0; the ratio of hydraulic retention time is (0.5-0.7): 1; the first dosing tube 4 and the second dosing tube 5 are identical in structure, small holes are formed in the length of the bottom 1/3 of each first dosing tube and are distributed in a quincunx shape, the diameter of each small hole is 1/10 of the diameter of each dosing tube, and the distance between the small holes is 5 times of the diameter of each small hole; the inclination angle of the upper part of the hopper 18 in the reaction chamber and the horizontal plane is 40 degrees.
One-step denitrification facility based on iron salt circulation in this embodiment adopts organic glass preparation, and wherein the material of mixed liquid back flow pipe is PVC. The one-step denitrification method based on the iron salt comprises the following steps: ammonia-containing wastewater enters a first reaction chamber I through a first reaction chamber water inlet pipe 1, and meanwhile, ferric salt is added into the first reaction chamber I through a first medicine adding pipe 4 in a ferric citrate form; the stirring device 6 continuously stirs to prevent the biological filler from sinking to the bottom so as to meet the requirement of the ammonia oxidation reaction, nitrite nitrogen generated by the reaction can rapidly react with ferrous ions under the acidic condition, and generated nitrous oxide gas is discharged through the first exhaust port 8. After the reaction in the first reaction chamber I, the generated mixed solution containing ferrous ions and nitrate flows to a second reaction chamber II through a second reaction chamber water inlet pipe 22 and a filter screen 7, the second reaction chamber II is under an anoxic condition, and a stirrer 6 is arranged in the second reaction chamber II to ensure that the reaction is fully carried out. Nitrate and ferrous ions are subjected to denitrification under the action of autotrophic denitrifying bacteria, and generated nitrogen is discharged along with the second exhaust port 9. The mixed solution generated in the first reaction chamber I is acidic, can neutralize part of hydroxide ions generated in the second reaction chamber II, and is characterized in that a proper amount of hydrochloric acid is added from the second medicine adding pipe 5 in order to ensure that the solution in the second reaction chamber II is acidic and does not generate ferric hydroxide precipitate, the pH meter 10 monitors the reaction condition on line, and the solution in the second reaction chamber II of the system is always non-alkaline. Opening the second valve 13 and the sixth valve 23, closing the third valve 14, setting a reverse osmosis membrane 11 at the water outlet pipe 12 of the second reaction chamber to intercept iron ions in the second reaction chamber II, continuously discharging water along with the second reaction chamber II, continuously increasing the concentration of the iron ions, closing the second valve 13, the fourth valve 16 and the sixth valve 23 when the internal and external pressure difference of the reverse osmosis membrane 11 is greater than 15psi (namely 1.5 kg), opening the third valve 14, and returning concentrated ferric ions to the water inlet pipe 1 of the first reaction chamber by using the reflux pump 15 so as to enter the first reaction chamber I for recycling. The second reaction chamber II is provided with a mud bucket 18 and a mud pipe 19 for periodically discharging the fallen activated sludge. The flora is attached to the biological filler to form a biological film, and the organisms are uniformly distributed in the whole reaction chamber, thereby being beneficial to the high-efficiency implementation of denitrification and nitrification.
Claims (6)
1. A one-step denitrification device based on iron salt circulation is characterized by comprising a first reaction chamber (I) and a second reaction chamber (II), wherein the first reaction chamber (I) is arranged above the second reaction chamber (II), and the first reaction chamber (I) is connected with the second reaction chamber (II) through a second reaction chamber water inlet pipe (22); a filter screen (7) is arranged at the upper port of a water inlet pipe (22) of the second reaction chamber, a first dosing pipe (4) and a first exhaust port (8) are arranged at the top of the first reaction chamber (I), and a second dosing pipe (5) and a second exhaust port (9) are arranged at the top of the second reaction chamber (II); microorganism carriers (3) are uniformly distributed in the first reaction chamber (I) and the second reaction chamber (II), wherein ammonia oxidizing bacteria capable of oxidizing ammonia by ferric iron are attached to the microorganism carriers (3) in the first reaction chamber (I), and denitrifying bacteria capable of denitrifying by ferrous iron are attached to the microorganism carriers (3) in the second reaction chamber (II); a mud bucket (18) is arranged at the bottom of the second reaction chamber (II), and a mud discharge pipe (19) is connected to the bottom of the mud bucket (18); stirring devices (6) are arranged in the first reaction chamber (I) and the second reaction chamber (II), and the first reaction chamber (I) is also provided with a first reaction chamber water inlet pipe (1); the second reaction chamber (II) is provided with a water outlet pipe (12), the inlet end of the water outlet pipe (12) is provided with a reverse osmosis membrane (11), and the second reaction chamber (II) is connected with the first reaction chamber (I) through a reflux branch; the second reaction chamber (II) is provided with a pH meter (10).
2. The one-step denitrification apparatus based on iron salt cycle of claim 1, wherein the first reaction chamber inlet pipe (1) is connected to the lower part of the first reaction chamber (I).
3. The one-step denitrification apparatus based on iron salt cycle of claim 1, wherein the inlet of the outlet pipe (12) and the inlet of the return pipe (17) of the second reaction chamber are connected with the lower part of the second reaction chamber (II).
4. The one-step denitrification apparatus based on iron salt cycle of claim 1, wherein the second reaction chamber (II) is connected with a high pressure pump (21).
5. The one-step denitrification device based on iron salt circulation of claim 1, wherein the reflux branch comprises a reflux pump (15), the inlet of the reflux pump (15) is connected with the lower part of the second reaction chamber (II) through a pipeline, and the outlet of the reflux pump (15) is connected with the inlet of the first reaction chamber (I) through a pipeline.
6. The one-step denitrification device based on iron salt circulation of claim 1, wherein the first dosing pipe (4) and the second dosing pipe (5) have the same structure and are hollow tubular structures, and through holes are uniformly formed in the lower surfaces of the first dosing pipe (4) and the second dosing pipe (5).
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| CN201921620819.2U CN210710943U (en) | 2019-09-26 | 2019-09-26 | One-step denitrification device based on iron salt circulation |
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| CN201921620819.2U CN210710943U (en) | 2019-09-26 | 2019-09-26 | One-step denitrification device based on iron salt circulation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110510743A (en) * | 2019-09-26 | 2019-11-29 | 西安建筑科技大学 | A kind of step nitrogen rejection facility and method based on molysite circulation |
| CN114409101A (en) * | 2022-03-31 | 2022-04-29 | 北京林业大学 | Nitrogen and phosphorus removal sewage treatment system and method based on iron reduction and oxidation circulation |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110510743A (en) * | 2019-09-26 | 2019-11-29 | 西安建筑科技大学 | A kind of step nitrogen rejection facility and method based on molysite circulation |
| CN110510743B (en) * | 2019-09-26 | 2024-03-15 | 西安建筑科技大学 | One-step denitrification device and method based on ferric salt circulation |
| CN114409101A (en) * | 2022-03-31 | 2022-04-29 | 北京林业大学 | Nitrogen and phosphorus removal sewage treatment system and method based on iron reduction and oxidation circulation |
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